Arthur S. Greenspan

Arthur Greenspan helps financial services and other corporate clients effectively navigate and defend governmental and regulatory investigations and complex securities and other financial litigation. He also represents senior executives and professionals in both investigations and litigations. more +

Mr. Greenspan has particular expertise in defending claims or investigations alleging securities and commodities fraud; accounting, internal control and disclosure violations; insider trading; market manipulation; Foreign Corrupt Practices Act violations; and antitrust violations. He also has substantial experience in litigating trading and transactional disputes.

Mr. Greenspan has represented clients in investigations and proceedings of the United States Congress, the U.S. Department of Justice, the Securities and Exchange Commission, the Commodity Futures Trading Commission, the Board of Governors of the Federal Reserve System, the Office of the Comptroller of the Currency, the Office of the Attorney General of the State of New York and the Financial Industry Regulatory Authority. He also has extensive experience representing clients in federal and state courts and in arbitration proceedings.

His exemplary work and professionalism have earned him recognition as a top litigator and a leader within the legal community. He has been consistently recognized in New York Super Lawyers (2007-2017) in the areas of Securities Litigation and White Collar Criminal Defense. He has been a vice president of the Federal Bar Council (2011-2017) and served as president of the Federal Bar Council American Inn of Court (2009-2010).

Mr. Greenspan earned his Bachelor of Science in Engineering degree, summa cum laude, from Princeton University in 1986. He graduated magna cum laude from Harvard Law School in 1989. He served as a law clerk for the Honorable John M. Walker, Jr., of the United States Court of Appeals for the Second Circuit in 1989-1990.

He is admitted to practice in the State of New York, the United States District Courts for the Southern and Eastern Districts of New York, and the United States Court of Appeals for the Second Circuit. 

• Public company board committee in internal and SEC investigations of potential accounting and disclosure violations.
• Hedge fund in connection with insider trading and market manipulation allegations made by French financial markets authority.
• Brokerage firm in internal investigation and potential regulatory investigation concerning possible insider trading.
• Securities firm in industry-wide FINRA investigation concerning research analyst communications with issuers and sponsors in connection with IPOs.

• Hedge fund in SEC investigation regarding collateralized debt obligations (CDOs) backed by subprime mortgage assets.
• Public company board committee in internal investigation regarding allegations of insider trading made by an institutional shareholder.
• Private equity funds in connection with internal investigation regarding management of real estate investments.
• Major bank in putative antitrust class actions alleging price-fixing conspiracy and manipulation in auction rate securities market.
• Securities firm in litigation with counterparty bank concerning disputed credit default swap in subprime mortgage-backed securities market.
• Pharmaceutical company in DOJ investigation concerning alleged Medicare fraud in enteral nutrition industry.
• Securities firm in SEC FCPA investigation concerning Latin American sovereign debt transactions.
• Former SEC officials as amici curiae before U.S. Supreme Court in Gabelli v. SEC.
• Financial economists as amici curiae before U.S. Court of Appeals for Second Circuit in Petrobras securities litigation.  

Individual Clients

• Former senior executive of large financial institution in connection with DOJ, SEC, CFTC, Federal Reserve and Congressional investigations relating to trading losses in synthetic credit portfolio.
• Swiss private banker charged criminally by DOJ with aiding and abetting U.S. clients in evading taxes.
• Former senior executives and traders at major securities firms in DOJ, SEC and NY AG investigations concerning residential mortgage-backed securities (RMBS) and CDOs.
• Former head of bank's municipal derivatives sales desk in DOJ, SEC and OCC investigations concerning alleged anti-competitive practices in municipal derivatives market.
• Executive at large manufacturing company in DOJ antitrust and FCPA investigations concerning marine hose industry.

Selected by Super Lawyers Magazine as a New York Super Lawyer in Securities Litigation and White Collar Criminal Defense (2007-2019)  

Vice President, Federal Bar Council (2011-2017)

President, Federal Bar Council American Inn of Court (2009-2010)

Member, Committee on White Collar Criminal Litigation, New York State Bar Association